a ) \(x\left(3x-2\right)-3x\left(x+5\right)=-34\)
\(\Leftrightarrow3x^2-2x-3x^2-15x=-34\)
\(\Leftrightarrow-17x=-34\)
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
b ) \(\left(2x+3\right)\left(3x-2\right)-6x\left(x-\dfrac{1}{2}\right)=26\)
\(\Leftrightarrow6x^2+9x-4x-6-6x^2+\dfrac{6x}{2}=26\)
\(\Leftrightarrow5x-6+3x=26\)
\(\Leftrightarrow8x=32\)
\(\Leftrightarrow x=4\)
Vậy \(x=4\)